USER'S AND
MAINTENANCE
MANUAL
Date:
01/31/2020
Code
MAN D185T4F-DB
ENG
Air Compressor : D185T4F-DB
Revision 03
Copyright © 2014, ROTAIR S.P.A. - All rights reserved
.
This manual is intellectual property of ROTAIR S.P.A.
Its full or partial reproduction is forbidden under any form, on any support and by any means, without the
written authorization by ROTAIR S.P.A.
Page
56/59
15 FAULTS AND TROUBLESHOOTING
Abnormal
Cause
Solution
The engine will
not start
Battery discharged or defective
Recharge and replace if necessary
Terminals of the battery cables
oxidized or loose
Clean or tighten the connections
No fuel
Top off the fuel in the diesel tank
Faulty fuel soleoid
Seek customer service by the manufacturer of the
engine
Air in the fuel pipe
Locate the leak by carefully inspecting all fuel
lines and make repairs as necessary
Injection pump defective
Seek customer service support from the
engine manufacturer
Temperature sensors defective
They are located at:
- Cylinder head
- Output of air compressor
- Oil mist separator tank
One at a time, unplug the wire from each sensor to
identify the defective sensor and then replace it. The
temperature light on the control panel should go off when
the faulty sensor is disconnected.
Starter defective
i
njectors failures
Seek customer service support from the
engine manufacturer
When opening
the air valves,
the engine does
not accelerate
Maximum pressure valve defective
Remove the maximum pressure valve spring and
conical seat. Inspect the valve and seat. If a
defect cannot be found and repaired, the valve
must be replaced.
The engine
speeds up but no
air comes out
Minimum pressure control valve
blocked
Disassemble and check that the piston is free to
move. Check that the spring is intact. If the defect
cannot be repaired, the valve must be replaced.
Reassemble and adjust the minimum pressure
,
following the instructions in Section 11.3.
The machine
stops suddenly
and can only be
restarted after a
few minutes of
waiting
A temperature sensor detects a
high temperature and
consequently stops the machine
Disconnect one sensor at a time and locate the
sensor that caused the engine to stop. If that
sensor is on the engine, check the oil level, the
voltage, and the condition of the alternator belt.
For water-cooled engines, check the coolant
level. If the faulty sensor was the sensor on the
compressor control, check the level of oil in the
tank and fill as needed.
